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Derivative Financial Instruments - Fair Value and Related Number of Derivative Contracts Categorized by Type of Derivative Contract (Details)
$ in Thousands
May 31, 2025
USD ($)
Contract
Nov. 30, 2024
USD ($)
Contract
Derivatives, Fair Value [Line Items]    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Financial instruments owned Financial instruments owned
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Financial instruments sold, not yet purchased, at fair value Financial instruments sold, not yet purchased, at fair value
Net amounts per consolidated statements of financial condition, assets $ 1,288,486 $ 517,775
Net amounts per consolidated statements of financial condition, liabilities 722,726 710,314
Exchange-traded    
Derivatives, Fair Value [Line Items]    
Fair value, assets 1,816,106 682,622
Fair value, liabilities 1,024,054 521,919
Amounts offset in the consolidated statements of financial condition, assets (981,970) (476,364)
Amounts offset in the consolidated statements of financial condition, liabilities (981,970) (476,364)
Cleared OTC    
Derivatives, Fair Value [Line Items]    
Fair value, assets 333,105 1,065,726
Fair value, liabilities 342,578 1,069,382
Amounts offset in the consolidated statements of financial condition, assets (330,271) (1,058,995)
Amounts offset in the consolidated statements of financial condition, liabilities (339,425) (1,066,232)
Bilateral OTC    
Derivatives, Fair Value [Line Items]    
Fair value, assets 1,855,093 1,437,178
Fair value, liabilities 2,443,572 1,912,726
Amounts offset in the consolidated statements of financial condition, assets (1,403,577) (1,132,392)
Amounts offset in the consolidated statements of financial condition, liabilities (1,766,083) (1,251,117)
Derivatives designated as accounting hedges:    
Derivatives, Fair Value [Line Items]    
Fair value, assets 3,574 45,299
Fair value, liabilities 55,950 0
Derivatives designated as accounting hedges: | Interest rate contracts: | Cleared OTC    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 1,712 $ 3,396
Number of contracts, assets | Contract 3 3
Fair value, liabilities $ 0 $ 0
Number of contracts, liabilities | Contract 0 0
Derivatives designated as accounting hedges: | Foreign exchange contracts: | Bilateral OTC    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 1,862 $ 41,903
Number of contracts, assets | Contract 1 3
Fair value, liabilities $ 55,950 $ 0
Number of contracts, liabilities | Contract 3 0
Derivatives not designated as accounting hedges:    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 4,000,730 $ 3,140,227
Fair value, liabilities 3,754,254 3,504,027
Derivatives not designated as accounting hedges: | Interest rate contracts: | Exchange-traded    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 536 $ 273
Number of contracts, assets | Contract 46,274 16,548
Fair value, liabilities $ 0 $ 13
Number of contracts, liabilities | Contract 23,687 32,984
Derivatives not designated as accounting hedges: | Interest rate contracts: | Cleared OTC    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 329,900 $ 1,030,842
Number of contracts, assets | Contract 7,826 6,663
Fair value, liabilities $ 331,751 $ 1,030,671
Number of contracts, liabilities | Contract 8,253 6,891
Derivatives not designated as accounting hedges: | Interest rate contracts: | Bilateral OTC    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 329,124 $ 365,678
Number of contracts, assets | Contract 1,167 1,096
Fair value, liabilities $ 682,976 $ 717,255
Number of contracts, liabilities | Contract 1,365 1,256
Derivatives not designated as accounting hedges: | Foreign exchange contracts: | Bilateral OTC    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 161,844 $ 132,240
Number of contracts, assets | Contract 37,567 57,786
Fair value, liabilities $ 136,950 $ 138,608
Number of contracts, liabilities | Contract 12,957 35,545
Derivatives not designated as accounting hedges: | Equity contracts: | Exchange-traded    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 1,815,569 $ 682,327
Number of contracts, assets | Contract 2,837,638 1,777,822
Fair value, liabilities $ 1,023,820 $ 521,889
Number of contracts, liabilities | Contract 1,617,971 1,574,498
Derivatives not designated as accounting hedges: | Equity contracts: | Bilateral OTC    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 1,293,083 $ 855,169
Number of contracts, assets | Contract 34,451 33,516
Fair value, liabilities $ 1,521,811 $ 1,024,129
Number of contracts, liabilities | Contract 32,884 20,587
Derivatives not designated as accounting hedges: | Commodity contracts: | Exchange-traded    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 1 $ 22
Number of contracts, assets | Contract 903 806
Fair value, liabilities $ 234 $ 17
Number of contracts, liabilities | Contract 823 697
Derivatives not designated as accounting hedges: | Commodity contracts: | Bilateral OTC    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 4,252 $ 4,570
Number of contracts, assets | Contract 9,900 11,691
Fair value, liabilities $ 1,475 $ 1,381
Number of contracts, liabilities | Contract 4,372 5,180
Derivatives not designated as accounting hedges: | Credit contracts: | Cleared OTC    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 1,493 $ 31,488
Number of contracts, assets | Contract 52 66
Fair value, liabilities $ 10,827 $ 38,711
Number of contracts, liabilities | Contract 6 32
Derivatives not designated as accounting hedges: | Credit contracts: | Bilateral OTC    
Derivatives, Fair Value [Line Items]    
Fair value, assets $ 64,928 $ 37,618
Number of contracts, assets | Contract 9 16
Fair value, liabilities $ 44,410 $ 31,353
Number of contracts, liabilities | Contract 23 32